package com.example.yls.demoa;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.icu.util.Measure;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by yls on 2019/5/17.
 */

public class WuziqiView extends View {
    private int mPanelWidth;
    private float mLineHeight;
    private int MAX_LINE = 10;
    private int MAX_COUNT_IN_LINE = 5;
    private Paint mPaint = new Paint();

    private Bitmap mWhitePiece;
    private Bitmap mBlackPiece;
    private float ratioPieceOfLineHeight = 3 * 1.0f / 4;

    private boolean mIsWhite = true;
    private List<Point> mWhiteArray = new ArrayList<>();
    private List<Point> mBlackArray = new ArrayList<>();

    private boolean mIsGameOver;
    private boolean mIsWhiteWinner;

    public WuziqiView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        setBackgroundColor(0x44ff0000);
        init();
    }

    private void init() {
        mPaint.setColor(0x88000000);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mWhitePiece = BitmapFactory.decodeResource(getResources(), R.drawable.stone_w2);
        mBlackPiece = BitmapFactory.decodeResource(getResources(), R.drawable.stone_b1);


    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawBoard(canvas);
        drawPieces(canvas);
        checkGameOver();
    }

    private void checkGameOver() {
        boolean whiteWin = checkFiveInLine(mWhiteArray);
        boolean blackWin = checkFiveInLine(mBlackArray);
        if (whiteWin || blackWin) {
            mIsGameOver = true;
            mIsWhiteWinner = whiteWin;
            String text = mIsWhiteWinner ? "白棋胜利" : "黑棋胜利";
            Toast.makeText(getContext(), text, Toast.LENGTH_SHORT).show();

        }
    }

    private boolean checkFiveInLine(List<Point> points) {
        for (Point p : points) {
            int x = p.x;
            int y = p.y;
            boolean win = checkHorizontal(x, y, points);
            if (win) return true;
            win = checkVertical(x, y, points);
            if (win) return true;
            win = checkLeftDiagonal(x, y, points);
            if (win) return true;
            win = checkRightDiagonal(x, y, points);
            if (win) return true;
        }


        return false;

    }

    private boolean checkHorizontal(int x, int y, List<Point> points) {

        int count = 1;
        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x - i, y))) {
                count++;
            } else {
                break;
            }
        }

        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x + i, y))) {
                count++;
            } else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;

    }


    private boolean checkVertical(int x, int y, List<Point> points) {

        int count = 1;
        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x, y - i))) {
                count++;
            } else {
                break;
            }
        }

        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x, y + i))) {
                count++;
            } else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;

    }


    private boolean checkLeftDiagonal(int x, int y, List<Point> points) {

        int count = 1;
        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x - i, y + i))) {
                count++;
            } else {
                break;
            }
        }

        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x + i, y - i))) {
                count++;
            } else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;

    }

    private boolean checkRightDiagonal(int x, int y, List<Point> points) {

        int count = 1;
        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x - i, y - i))) {
                count++;
            } else {
                break;
            }
        }

        for (int i = 1; i < MAX_COUNT_IN_LINE; i++) {
            if (points.contains(new Point(x + i, y + i))) {
                count++;
            } else {
                break;
            }
        }
        if (count == MAX_COUNT_IN_LINE) return true;
        return false;

    }

    private void drawPieces(Canvas canvas) {
        for (int i = 0, n = mWhiteArray.size(); i < n; i++) {
            Point whitePoint = mWhiteArray.get(i);
            canvas.drawBitmap(mWhitePiece,
                    (whitePoint.x + (1 - ratioPieceOfLineHeight) / 2) * mLineHeight,
                    (whitePoint.y + (1 - ratioPieceOfLineHeight) / 2) * mLineHeight, null);
        }
        for (int i = 0, n = mBlackArray.size(); i < n; i++) {
            Point blackPoint = mBlackArray.get(i);
            canvas.drawBitmap(mBlackPiece,
                    (blackPoint.x + (1 - ratioPieceOfLineHeight) / 2) * mLineHeight,
                    (blackPoint.y + (1 - ratioPieceOfLineHeight) / 2) * mLineHeight, null);
        }
    }

    private void drawBoard(Canvas canvas) {
        int w = mPanelWidth;
        float lineHeight = mLineHeight;
        for (int i = 0; i < MAX_LINE; i++) {
            int starX = (int) (lineHeight / 2);
            int endX = (int) (w - lineHeight / 2);
            int y = (int) ((0.5 + i) * lineHeight);
            canvas.drawLine(starX, y, endX, y, mPaint);
            canvas.drawLine(y, starX, y, endX, mPaint);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthMode = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int heightMode = MeasureSpec.getSize(heightMeasureSpec);

        int width = Math.min(widthSize, heightSize);
        if (widthMode == MeasureSpec.UNSPECIFIED) {
            width = heightSize;
        } else if (heightMode == MeasureSpec.UNSPECIFIED) {
            width = widthSize;
        }


        setMeasuredDimension(width, width);

    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mPanelWidth = w;
        mLineHeight = mPanelWidth * 1.0f / MAX_LINE;

        int pieceWidth = (int) (mLineHeight * ratioPieceOfLineHeight);
        mWhitePiece = Bitmap.createScaledBitmap(mWhitePiece, pieceWidth, pieceWidth, false);
        mBlackPiece = Bitmap.createScaledBitmap(mBlackPiece, pieceWidth, pieceWidth, false);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if (mIsGameOver) return false;

        int action = event.getAction();

        if (action == MotionEvent.ACTION_DOWN) {
            int x = (int) event.getX();
            int y = (int) event.getY();

            Point p = getValidPoint(x, y);
            invalidate();
            if (mWhiteArray.contains(p) || mBlackArray.contains(p)) {
                invalidate();
                return false;
            }
            if (mIsWhite) {
                invalidate();
                mWhiteArray.add(p);
            } else {
                invalidate();
                mBlackArray.add(p);
            }
            invalidate();
            mIsWhite = !mIsWhite;

            return true;
        }
        return true;


    }

    private Point getValidPoint(int x, int y) {
        return new Point((int) (x / mLineHeight), (int) (y / mLineHeight));

    }
}
